P87C51RB2BBD datasheet(31/67 Pages) PHILIPS

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Philips Semiconductors

Product data

P87C51RA2/RB2/RC2/RD2

80C51 8-bit microcontroller family 8KB/16KB/32KB/64KB OTP

with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high

speed (30/33 MHz)

2003 Jan 24

PX0

IP (0B8H)

Priority Bit = 1 assigns high priority

Priority Bit = 0 assigns low priority

BIT

SYMBOL

FUNCTION

IP.7

–

IP.6

PPC

PCA interrupt priority bit

IP.5

PT2

Timer 2 interrupt priority bit.

IP.4

Serial Port interrupt priority bit.

IP.3

PT1

Timer 1 interrupt priority bit.

IP.2

PX1

External interrupt 1 priority bit.

IP.1

PT0

Timer 0 interrupt priority bit.

IP.0

PX0

External interrupt 0 priority bit.

SU01291

PT0

PX1

PT1

PT2

PPC

–

Figure 16. IP Registers

PX0H

IPH (B7H)

Priority Bit = 1 assigns higher priority

Priority Bit = 0 assigns lower priority

BIT

SYMBOL

FUNCTION

IPH.7

–

IPH.6

PPCH

PCA interrupt priority bit

IPH.5

PT2H

Timer 2 interrupt priority bit high.

IPH.4

PSH

Serial Port interrupt priority bit high.

IPH.3

PT1H

Timer 1 interrupt priority bit high.

IPH.2

PX1H

External interrupt 1 priority bit high.

IPH.1

PT0H

Timer 0 interrupt priority bit high.

IPH.0

PX0H

External interrupt 0 priority bit high.

SU01292

PT0H

PX1H

PT1H

PSH

PT2H

PPCH

–

Figure 17. IPH Registers

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